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Chemical Ideas 6.2 What happens when radiation intracts with matter?

Explore the interaction between radiation and matter, understanding concepts like wavelength, frequency, energy, and electronic transitions. Learn about the effects of radiation on electrons and molecules. Practice problems to reinforce your understanding.

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Chemical Ideas 6.2 What happens when radiation intracts with matter?

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  1. Chemical Ideas 6.2What happens when radiation intracts with matter?

  2. c = λν λ = wavelength m lambda c = speed of light = 3.00 x 108 m s-1 ν = frequency Hz ( or s-1 ) nu Use m for λ c λ ν

  3. c = λν problems…. 1. Work out λ if v = 8.19 x 1013 Hz c = 3.00x108 m s-1

  4. Rearranging again…. E h

  5. E = hν problems … • h = 6.63 x 10-34 J Hz -1 • Planck constant 2. If the frequency is 3.5 x 1013 Hz, what is the energy of each photon? 3. If E = 4.6 x 10-17 J per photon, what is the frequency (ν) of the radiation?

  6. visible ultra violet E increases

  7. 1 2 3 4 What happens to electrons? Electrons absorb energy Electrons are excited Electrons move to higher energy level E = h v

  8. Molecules are made of more than one atom but they still have electrons. Electronic transitions Vis + UV

  9. Molecules move !

  10. There are vibrational energy levels as well as electronic energy level .. I.R.

  11. There are rotational energy levels as well as electronic energy level .. microwave

  12. Electronic transitions Rotational transitions Microwave Vis + UV I.R. Vibrational transitions

  13. Note the range in Table 1, P130 C-F C-Cl C-Br

  14. What could happen to a Cl2 molecule in the Atmosphere? Electronic transitions Visible Photodissociation radicals U.V. + Ionisation U.V.

  15. Now … • Read CI 6.2 for yourself • Complete Notes 3, 4 and 5 • Try Q1, 2 and 4 from CI 6.2. Only do Q4 if you are doing AS maths!

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